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This CL fixes 2 bugs:

1. Users might pin the internal app to the shelf. Clicking on it would
launch a real camera app, causing 2 camera icons shown on the shelf.
2. Users might pin the currently running camera app on the shelf. If the
users click on it afterward, it will bypass the internal app deciding
logic and always launch that specific app.

pinned the internal camera app icon, and launching camera app from it
does not show 2 camera icons on shelf.

Bug: b:117909556
Test: Tested on eve that pinning camera app on launcher or on shelf both
Change-Id: I0300456595e6c4c00c1a47f7a3bc7309d1230553
Reviewed-on: https://chromium-review.googlesource.com/c/1303327
Commit-Queue: Sheng-hao Tsao <shenghao@google.com>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603793}